Unreconized escape character secquence

Thanks for all your help guys;
I get an "Unrecognized escape character sequence" here,

Code:

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ifstream a_file ( "D:\ LotteryProgram / MegaMill" );  //Opens MegaMill for reading the file
 
  a_file >> str; //Reads one string from the file MegaMill

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and I don't understand it. Please explain why? . . . . therry

Because you should escape your backslashes within a string literal, e.g.,

Code:

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ifstream a_file ( "D:\\ LotteryProgram / MegaMill" );

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If you try to use a single backslash the compiler expects an escape character like \n newline etc. So as laserlight shows you have to add the extra oblique. As an example try outputting a quoted string and see what happens, eg show this including the quotes : "Hello World"